National Repository of Grey Literature 59 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Characterization of titanium laser welds
Chmelíčková, H. ; Hiklová, H. ; Václavek, L. ; Tomáštík, J. ; Čtvrtlík, Radim
Butt welding of commercially pure titanium Grade 1 and Ti6Al4V alloy sheets using a pulsed Nd:YAG laser KLS 246 - 102 LASAG were carried out to determine optimal values of pulse energy and pulse length to create completely penetrated weld. Surface peak power density of about 3.105−2 was found as an optimal value. Weld dimensions, both face width and penetration depth, are found to be proportional to increasing energy and decreasing pulse length. Gentle sagging and root penetration were revealed by means of contact surface profilometry. The nanohardness tests on transverse cross-sections detected approximately 50% higher hardness in the fusion zone than in the base material.\n
SMV-2020-38: Mauting_lasweld_heat_exchanger
Mrňa, Libor
Development of laser welding technology for a given large-scale cushion heat exchanger.
SMV-2020-36: Siemens_laserweld_parts_steam_turbine
Mrňa, Libor
Testing the possibilities of using laser welding technology for homogeneous and heterogeneous joints of steam turbine components from various types of austenitic, duplex and martensitic stainless steels.
SMV-2020-35: Lexron_laser_weld_turbine_housing_repair
Mrňa, Libor
Contract research in the field of overhaul of large-scale steel casting using laser welding technology, including metallography of welds and measurement of dimensional deviations caused by welding.
SMV-2020-34: Tecpa_laser_weld_chamber_austenite_ferrite
Mrňa, Libor
Verification of weldability of supplied assemblies of austenitic and ferritic stainless steels (eg AT-0493-A) using laser welding technology.
SMV-2020-32: Tescan_tube
Mrňa, Libor
Development of permanent joints using laser welding, implementation of test samples, vacuum-tightness tests.
Welding of 22MnB5 steel using Laser-TIG hybrid technology
Krejčí, Adam ; Sigmund, Marián (referee) ; Mrňa, Libor (advisor)
This thesis deals with usage of hybrid technology Laser-TIG for welding of boron enhanced steel 22MnB5. This thesis evaluates the influence of preheating using technology of TIG arc welding to a weld quality in comparison with laser welds. In practical part of thesis there were 1,8 mm metal sheets of 22MnB5 welded. This metal sheet specimens were welded by using constant parameters of laser with varying parameters of TIG technology. There were 12 specimens of sheet metal created including 3 specimens using only laser and 9 specimens using Laser-TIG hybrid technology while varying magnitude of current (I=20 A, 40 A a 60 A). Welds created this way were evaluated by tensile test and strength limits compared. Then metalografic survey was carried out examining macro and microstructure. Results of metalografic survey were confronted with Vickers hardness test.
SMV-2019-22: KeyDesign_laser svar
Mrňa, Libor
Verification of welding of aluminum packaging, possibilities of overlap welding of Cu and Al foils.
SMV-2019-24: SOTe_bellows
Mrňa, Libor
Design of laser welding technology of special bellows, sample realization.
SMV-2019-20: VVÚ_laser_balist
Mrňa, Libor
Research of dividing ballistic laminates (aramid, carbon, Dyneema and others) by laser and abrasive water jet.

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